Clock



FIG. 1 is a front elevational view of a clock shading my new design;

FIG. 2 is a top plan view of FIG. 5;

FIG. 3 is a right side elevational view thereof;

FIG. 4 is a bottom plan view of FIG. 5;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a top and left front perspective view thereof. 

The ornamental design for a clock, substantially as shown. 